Airborne Wireless Communication Modeling and Analysis with MATLAB

Over the past decade, there has been a dramatic increase in the use of unmanned aerial vehicles (UAV) for military, commercial, and private applications. Critical to maintaining control and a use for these systems is the development of wireless networking systems [1]. Computer simulation has increasingly become a key player in airborne networking developments though the accuracy and credibility of network simulations has become a topic of increasing scrutiny [2-5]. Much of the inaccuracies seen in simulation are due to inaccurate modeling of the physical layer of the communication system. This research develops a physical layer model that combines antenna modeling using computational electromagnetics and the two-ray propagation model to predict the received signal strength. The antenna is modeled with triangular patches and analyzed by extending the antenna modeling algorithm by Sergey Makarov, which employs Rao-Wilton-Glisson basis functions. The two-ray model consists of a line-of-sight ray and a reflected ray that is modeled as a lossless ground reflection. Comparison with a UAV data collection shows that the developed physical layer model improves over a simpler model that was only dependent on distance. The resulting two-ray model provides a more accurate networking model framework for future wireless network simulations

The Challenges of Low-Energy Secondary Electron Emission Measurement

The phenomena known as secondary electron emission was discovered over a century ago. Yet it remains very difficult to model accurately due to the limited availability of reliable experimental data. With the growing use of computer simulations in hardware development, the need for accurate models has increased. This research focused on determining what factors may be causing measurement discrepancies and methods for increasing the accuracy of measurements. It was found that several assumptions are commonly invoked when these measurements are performed that may not always be consistent with reality. The violation of these assumptions leads to measurement bias that is contingent upon the apparatus and the voltages used during the measurement. This research showed that secondary electron yield measurements are sensitive to changes in the apparatus geometry, the current level, and the electron gun settings. New techniques, hardware, and models were developed in order facilitate greater measurement repeatability and accuracy

Simulation of Increasing Night Temperature on Vegetative and Generative of Paddy (Oryza Sativa L.)

The rate of respiration increases with increasing temperature. It causes a problem to occur with photosynthesis result (photosynthate) generated during photosynthesis as a source of energy for metabolism of plants. The objective of this study was to evaluate of growth and the production result by affected an increasing night temperature on paddy. The simulation was performed in growth chamber with increased night temperature by 20 C (T1) and 40 C (T2) higher than normal night temperature (T0). Growth phase of rice plant treated an increase in night temperature among others on the vegetative phases continues on the generative phase (VG), was treated only on the vegetative phase (V) and treated only on the generative phase (G). The number of tillers, leaf area, number of leaf, the total dry weight of rice plant on the T2 had values that were lower than at T0 and T1. The decreased values in the parameter number of tillers, leaf area, number of leaf, and total dry weight at the end of the observation were observed on T2V and T2 VG. The T2 had longer panicle than T1 and T0, but the number of panicle, weight of seedper plant, harvest index (HI), the number of productive tillers, flowering time, harvesting time , nitrogen content in the leaves, the and percentage of open stomata values were lower than T1 and T0. T1G, T1VG, T2VG and T2G showed lower percentage of full grain than at T0. T1 and T2 treatments on VG and V resulted in the delay of flowering time. T1 and T2 on the VG phase resulted in the delay of harvesting time

Adult spawning and early larval development of the endangered bivalve Pinna nobilis

[EN] The development of aquaculture activities has posed an alternative solution for the preservation of some overexploited shell¿sh ¿sheries worldwide. In the same way, endemic Mediterranean bivalves such as Pinna nobilis, highly threatened by habitat loss and coastal pollution, could found in aquaculture a solution for preserving the continuity of the species. Given the endangered status of the species, the biological and ecological processes regulating natural populations have been well studied, but there are still important knowledge gaps preventing the development of viable arti¿cial cultures. This study describes for the ¿rst time the larval development of P. nobilis (from fertilization until pediveliger larval stages) in captivity conditions. Moreover, di¿erent rearing tanks of 5, 16 and 80 L, larvae density from 1 to 600 larvae mL¿1, light conditions, food doses, were tested in order to establish the bases for the optimal rearing of the species and provide a source of individuals for restoring ¿eld populations. Results showed that 16 L tanks with a concentration of 2 larvae mL¿1, constant temperature of 21 °C, 12/12 h photoperiod and fed with an ¿optimal¿ mixture of 25 cells per ¿L of Chaetoceros calcitrans + 33.3 cells per¿L ofPavlova lutheri + 100 cells per¿L ofIsochrysis galbana¿ appear to be the best conditions to rearlarvae ofP. nobilis.Di¿erentcaptivity conditions such as loweror highertank volume, larvae density, or food doses; light privation did not report better results for larval development.The present study was financed by the Caisse d'Epargne Cote d'Azur. We are also grateful to the research crew of the Institut Oceanographique Paul Ricard and the Catholic University of Valencia for their technical support and help collecting and maintaining fan mussels. Special thanks to the reviewers for their constructive and necessary suggestions.Trigos, S.; Vicente, N.; Prado, P.; Espinos Gutierrez, FJ. (2018). Adult spawning and early larval development of the endangered bivalve Pinna nobilis. Aquaculture. 483:102-110. doi:10.1016/j.aquaculture.2017.10.015S10211048

Found in Time

https://digitalcommons.montclair.edu/all_books/1209/thumbnail.jp

Preparing for Takeoff : Preproduction for the Independent Filmmaker

https://digitalcommons.montclair.edu/all_books/1210/thumbnail.jp

Preparing for Takeoff : Preproduction for the Independent Filmmaker

https://digitalcommons.montclair.edu/all_books/1210/thumbnail.jp

A phonological study of the tone-melody correspondence in Cantonese pop music

This PhD research aims at revealing the underlying complexity of the grammar of tone-melody mapping in Cantonese pop music. While linguists have shown a growing interest and invested painstaking effort in finding out whether lexical tones and musical melody interact in vocal music, the attention of these scholars mainly focuses on whether a lexical item remains intelligible to speakers of the given language when the tonal integrity is not preserved in the song. Others are interested in quantifying the degree of tone-melody correspondence and in carrying out cross-linguistic comparisons. The majority of such research studies fail to unravel the details of how tone and melody interact. This research challenges the methodologies and assumptions made in some previous studies that fail to account for the discrepancy between structural and perceptual ‘correspondence’ or ‘mismatch’. The notions of ‘correspondence’ and ‘mismatch’ are revisited and redefined from a perceptual perspective – a ‘perfect match’ refers to the mapping between a melodic transition and a tonal target transition that is satisfactorily accepted by native speakers of the language, whereas a ‘mismatch’ refers to a tone-melody pairing that sounds awkward to the native ear, whether or not the string of syllables are comprehensible, ambiguous or unintelligible when set to the song. Through conducting perception tests, songs are grouped into two main categories for two different purposes – the songs without perceptual mismatch are used for a profound analysis of the well-formed mapping patterns at the abstract level. The most frequently attested correspondence pattern concerns the pairing between tonal target transition and melodic transition progressing in the same direction. The directionality constraint is satisfied in about 80% of the cases. It is also revealed that level tonal target sequences can be mapped to non-level melodies and still remain well-formed. This mapping, however, is strictly conditional and only occurs when licensed. The other group of songs are those in which native speakers have identified cases of perceptual mismatch. By examining the ill-formed examples, other mapping constraints are uncovered – the interval constraint requires that the pitch distance of a melodic transition be comparable to that of the corresponding tonal target transition. The mapping criterion is therefore more like a ‘vector’, obliging the two transitions to agree not only in direction but also in slope. The Hidden Structure Alignment constraint is the third important mapping constraint discovered that succeeds in providing solutions to account for unusual pairings or mismatches that directionality and interval fail to explain. In order that a tonal target transition match a melodic transition, the hidden or phonetically unexpressed semitones on both tonal and melodic scales should be aligned to or absent from the same edge. This constraint is helpful to account for the extremely restricted mapping patterns at the song-final cadence. By investigating a large corpus of Cantonese pop songs written by various lyricists, this research proposes a detailed description of the grammar of Cantonese tone-melody mapping in terms of the interaction of the directionality, interval and hidden structure alignment constraints.published_or_final_versionLinguisticsDoctoralDoctor of Philosoph

Avoiding transients in low-level sensing of secondary electron yield

Despite the discovery of secondary electron emission over a century ago, repeatability in secondary electron emission measurements remains challenging. This work discusses the transient effects associated with sensing low-level currents during SEY measurements. Operations in the low-level range are shown to be prone to long settling times, transmission line effects, and capacitive coupling between isolated circuits. By programming our measurement system to avoid transients, our system was able to perform SEY measurements with currents as low as 140 fA